Firstly it is a header as in 1 not headers... Many people have had notable gain and mpg improvements(when driving correctly) with only a intake. There are dyno charts on fswerks for actual evidence. It is the first mod anyone here on the forum will probably suggest. I highly suggest the FSWERKS Cool Flo intake. Either that or steedas short ram intake, but I like the looks and performance of my FSWERKS much better. At one point I had only the CAI and it definitely makes a difference solely on its own.
Here is mine:

Bugman with your intake do you have to run it without the battery cover?

Car doesn't have a battery cover. I have had it for about 8 months now and have driven though many a rain, slush, and snow. No issues with the filter being wet at all. By using the OEM snorkel at the bottom of the metal enclosure and having it open on the headlight side any moisture drains off harmlessly.

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